Latest filingSep 03, 2026Most recent Form 4
PRTA
PROTHENA CORP PUBLIC LTD CO
NasdaqHealthcarePharmaceutical Preparations
Insider activity for last month from 08/04 to 09/04. Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total buying$69.5M2 buys
Total selling$00 sells
Net open-market+$69.5M1 insiders
Open-market mix
Buy vs sell distribution by transaction countInsider activity report
Monthly open-market purchase and sale counts Buys Sells
Transaction codes
By Form 4 transaction code in selected period4transactions
- G · Gifts · dominant2 · 50%
- P · Open-market buys2 · 50%
Activity by reported role
A joint filing can contribute to multiple roles4transactions
- 10% owner · dominant4 · 100%
Distinct insiders active
Reporting-owner CIKs by month · peak Aug 2026 (1)Aug 2026Sep 2026
Reported Holdings After
Separated by insider, security, and ownership typeScully William POrdinary Shares, par value $0.01 per share · Direct
827,000Sep 02, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Each cell is one day · intensity = transactions · buys green, sells redAug 04 → Sep 04
LessMore
Top insiders
By absolute net value across the selected period- SP+$695.2k
Filing detail checks
Secondary metrics for the selected periodFiling-only signals
Deterministic matches in the selected period
PRTA transaction history
Filters apply within this company and selected period by default| Ticker | Insider | Role | Type | Shares | Value | Code | Signals | 90d return | Filed | Trans date |
|---|---|---|---|---|---|---|---|---|---|---|
| PRTA | SCULLY WILLIAM P | 10% | buy | 27.0k | $25.5M | P | — | 0.0% | 09/03 | 09/02 |
| PRTA | SCULLY WILLIAM P | 10% | buy | 50.0k | $43.9M | P | −1.2% | 08/21 | 08/20 |
PROTHENA CORP PUBLIC LTD CO Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at PROTHENA CORP PUBLIC LTD CO?
SCULLY WILLIAM P.
When was the latest reported open-market purchase?
Scully William P reported a buy on Sep 02, 2026 valued at $25.5M. Read the SEC filing.
When was the latest reported open-market sale?
No code-S sale is available for this period.
What is the recent purchase and sale balance?
Net open-market buying in the selected period was $695,168.60. This describes filed transactions, not a bullish rating.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.